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Full text of "The Cambridge Natural History"

PROTORRODON

young. There are
several species. A.gri~
ocJioerus,likQ Oreodon
and primitive Ungu-
lates in general, had a
long tail. The genus
thus shows a mixture
of ancient and special-
ised characters*
The most ancient
form of Oreodont is
Protoreodon. This is
Eocene, and became
extinct during that
period. It had a com-
plete dentition, open
orbit,, and no lachry-
mal fossa. The fore-
feet were five - toed,
the hind four-toed.
Fam.   Amoplo-
theriidae. —This
family is entirely
Eocene   in   point  of
time, and is unknown
outside Europe.    The
dentition    of   the
group   is   complete;
the molars are seleno-
bunodont, like those
of  the   Anthraco-
theriidae.    The bones
of the carpus, tarsus,
metacarpus andmeta-,
tarsus  are   all  free;
the toes are four to
two   in   number   oa
each foot.    The orbit
is widely open behind.
The tail is long, as in